﻿#region BSD 3-Clause License
/* Copyright (c) 2012, Intel Corporation
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *    
 * 3. Neither the name of Intel Corporation nor the names of its contributors may
 *    be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace OpenHopla.Timing
{
    public partial class Stopwatch
    {
        private bool _isRunning = false;
        private IList<TimeSpan> _lapTimes = new List<TimeSpan>();
        private TimeSpan _accumulatedTime = TimeSpan.Zero;
        private DateTime _startTime = DateTime.MinValue;

        private void Start()
        {
            _startTime = DateTime.Now;
            _isRunning = true;
        }

        private void Stop()
        {
            _accumulatedTime = AccumulatedTime;
            _isRunning = false;
        }

        private void Lap()
        {
            _lapTimes.Add(AccumulatedTime);
        }

        private void Reset()
        {
            _accumulatedTime = TimeSpan.Zero;
            _lapTimes.Clear();
        }

        private TimeSpan DeltaTime()
        {
            return DateTime.Now - _startTime;
        }
    }

    public partial class Stopwatch : IStopwatch
    {
        public void StartStop()
        {
            if (IsStopped)
            {
                Start();
            }
            else
            {
                Stop();
            }
        }

        public void LapReset()
        {
            if (IsRunning)
            {
                Lap();
            }
            else
            {
                Reset();
            }
        }

        public bool IsStopped
        {
            get
            {
                return !IsRunning;
            }
        }

        public bool IsRunning
        {
            get
            {
                return _isRunning;
            }
        }

        public TimeSpan AccumulatedTime
        {
            get
            {
                return (IsStopped) ? _accumulatedTime : _accumulatedTime + DeltaTime();
            }
        }

        public ReadOnlyCollection<TimeSpan> LapTimes
        {
            get
            {
                return new ReadOnlyCollection<TimeSpan>(_lapTimes);
            }
        }
    }
}
